Comments (2)
This is an issue with the "never type fallback".
try { x? }
allows rust to coerce the !
that is un- and re-wrapped, so the type of this is basically Result<?0t, u32>
(where ?0t
is a variable, signifying that compiler doesn't yet know the type). Then you require that ?0t
implements impl Into<!>
. Any number of types can implement Into<!>
, so the type here is not really inferable. Rustc currently uses ()
as the default type in cases like this, so you get an error.
In the 2024 edition (and possibly in all editions in a later rustc version) we plan to change that which would fix your example. (although I would suggest just not using Into<!>
, if possible)
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Thanks for the explanation! I'll just wait for the 2024 edition then. (Regarding not using Into<!>
, that's not simple because this happens in generic code where I actually have Into<T>
and the problem occurs only when T
is instantiated with !
.)
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